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8051 Microcontrollers, 2nd Edition by Subrata Ghoshal

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17

INTERFACING: EXTERNAL MEMORY

CHAPTER OBJECTIVES

In this chapter, the reader is introduced to interfacing of external memory devices with 8051 microcontroller. After completion of the chapter, the reader should be able to understand

  • How to interface external RAM and ROM with MCS-51.
  • Related timing diagrams for external memory access.
  • Security features offered by MCS-51 through on-chip program lock bits.

17.1 | Introduction

As we have completed major discussions on internal architecture and instructions of MCS-51, we now may focus on various interfacing issues related to it. We start with external memory interfacing.

17.1.1 | Need of External Memory

At this stage, the reader may ask about the need of external memory interfacing. As a matter ...

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